Malicious PDF — malware analysis report

Static analysis result for SHA-256 4447a1a3061c5cf5…

MALICIOUS

PDF

75.6 KB Created: 2021-09-09 15:12:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: b83a356fa270d61a1b7b53c4b3ce62d4 SHA-1: 36b6741c172196c605c7af83784ba1040c97f452 SHA-256: 4447a1a3061c5cf52d1cd0f2c31a5b948ad7fd024ddf2f10c0bb62aa63a57a03
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV and an ML classifier as malicious. It contains numerous embedded URLs, many of which point to suspicious domains and appear to be part of a link farm. The presence of these links suggests the document's primary purpose is to redirect users to potentially malicious websites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://bakefruit.com/uploads/files/202109022017159553.pdf In PDF document text
    • http://devison-matras.ru/upload/file/bumalif.pdfIn PDF document text
    • http://dcbestwings.com/uploads/files/72820270174.pdfIn PDF document text
    • https://fulzugaskozpont.hu/files/sigowibiwajegerubasapogi.pdfIn PDF document text
    • http://solamsys.com/userData/board/file/35337046238.pdfIn PDF document text
    • http://xn--tnqz8hz5cb8l.com/upload/files/jazajixotok.pdfIn PDF document text
    • http://kangshi-you.com/uploads/files/202109050210502908.pdfIn PDF document text
    • https://minhvuongthuphap.com/upload/ck/files/gopegazegidiji.pdfIn PDF document text
    • http://tsnpharma.com/upload/files/82233796730.pdfIn PDF document text
    • http://crescentcarpets.com/userfiles/file/77426809995.pdfIn PDF document text
    • https://salondumariagededijon.com/userfiles/file/xutusope.pdfIn PDF document text
    • http://hnfhdc.com/UpLoadFile/2021090205295677468.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613275bf74638---mazokazezewaxeduberekos.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/3ae81c8b55d4f83ae27902b2a859d2d1/lilomejuwebi.pdfIn PDF document text
    • http://euroear.eu/ckfinder/userfiles/files/fonukop.pdfIn PDF document text
    • http://espacioschillout.es/images/admin/file/48875398366.pdfIn PDF document text
    • http://easy-sleep24.de/shop/images/editorfiles/file/67750832845.pdfIn PDF document text
    • https://xn--atpta-nfb.lv/images/userfiles/files/30013549642.pdfIn PDF document text
    • https://girisimhaber.com/uploads/file/xunuwiremagotig.pdfIn PDF document text
    • https://probidjp.com/ckfinder/userfiles/files/20210906_153346.pdfIn PDF document text
    • http://naviway.su/upload/files/kazutejok.pdfIn PDF document text
    • http://baocaosuhoatoc.com/luutru/files/kededetopaxujogukajo.pdfIn PDF document text
    • https://barcelonacentromedico.es/files/galeria/files/temibimuporeloz.pdfIn PDF document text
    • http://usatovl.ru/upload/fckeditorfile/67307775132.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=asphalt+nitro+mod+latest+versionPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b9e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9E5 16580 bytes
SHA-256: 8c8784a865c3c7ebb35011cdcadf541bac321155f0024eba3288e8cbb644b185
font_01_sfnt_off0000e4af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fcbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCBC 2032 bytes
SHA-256: 09cd6691fbbb1627d0dfc7da6220768119224cc7e55eca7214a61afd6cffd665
font_03_sfnt_off00010616.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10616 10704 bytes
SHA-256: f342ff584aa7d9b03e61a3935c4a69369f88fb63427312fbad23fd396809fa85